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Latching Relay
ERROR: 85 & 86 should be reversed
A simple circuit that can be used for a variety of applications. If the diode is replaced with a wire, the circuit will still work, but if the relay contacts ever fail, the ON switch will carry all the current to the load while it's pressed.
The 2 switches can be replaced with a DPDT momentary up-down switch, or existing switches in other circuits could be used.
For example, the ON switch might be the START circuit of the ignition switch; the OFF switch might be the RHR power window switch; and the load might be an auxilliary horn. If the vehicle is ever started without the RHR window switch in the correct position, the auxilliary horn would latch on as a theft alarm until the RHR window switch is pressed. Since window power is disabled during starting, the circuit wouldn't backfeed if the switch is held during cranking.
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